压力过载对萨尔科梅尔蛋白突变诱导的多变性心肌病的后果
Joachim P Schmitt1, Christopher Semsarian, Michael Arad
1Department of Genetics, Harvard Medical School and Howard Hughes Medical Institute, Boston, Mass 02115, USA.
Circulation
|August 20, 2003
概括
心脏重塑途径在高性心肌病 (HCM) 和高血压中是独立的. 瘤突变和氨酸抑制激活了一个共同的途径,指导未来的心脏缩疗法.
科学领域:
- 心脏病学 心脏病学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 研究心室重塑的常见或独立的分子机制,在缩性心肌病 (HCM) 和全身高血压.
- 在增加左心室 (LV) 负荷下评估HCM小鼠模型中的心脏缩.
研究的目的:
- 为了确定心室重塑途径在高血压和高血压是共享的还是独立的.
- 阐明心脏缩背后的分子机制.
主要方法:
- 在具有和没有Arg403Gln心脏肌重链突变 (alphaMHC403/+) 的小鼠中使用横向大动脉带.
- 在增加LV负荷下,野生型和突变型小鼠之间比较左心室压力和缩标志物 (LV前壁厚度).
- 给药环素A,以评估其对αMHC403/+小鼠过度缩小的作用.
主要成果:
- 带带野生型和alphaMHC403 / +小鼠的升高的LV压力类似,死亡率相似,心力衰竭没有发展.
- 在129SvEv野生型和alphaMHC403/+小鼠中,负载诱导的缩是相同的.
- 遗传上超出品种的黑色瑞士 (BS) alphaMHC403/+小鼠表现出轻微过度的过度缩,这表明基因位点发生了修饰.
- 环素A治疗显著增加了带状αMHC403/+小鼠的缩,表明通过共享途径可能有更大的缩.
结论:
- 独立的心脏重塑途径存在于负载诱导的缩和HCM.
- 同时存在的高血压和HCM不太可能由于独立的途径导致心脏缩严重恶化.
- 瘤突变和氨酸抑制 (通过环素A) 汇聚在一个共享的过度缩信号通路上.
- 确定不同的信号通路对于定制心脏缩治疗方法至关重要.
关键词:
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